From: Min M Xu <min.m.xu@intel.com>

RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3937

In TDVF the hob list is constructed at the memory region which is the
largest one below 4GB. After lazy accept is introduced, the
MaxAcceptedMemoryAddress (which is tha max accpeted memory address in
lazy accept) should be considered.

Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
---
 OvmfPkg/Library/PeilessStartupLib/Hob.c       | 23 ++++++++++++++++++-
 .../PeilessStartupLib/PeilessStartupLib.inf   |  1 +
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/OvmfPkg/Library/PeilessStartupLib/Hob.c b/OvmfPkg/Library/PeilessStartupLib/Hob.c
index a9b92b5fbaba..884490af68fd 100644
--- a/OvmfPkg/Library/PeilessStartupLib/Hob.c
+++ b/OvmfPkg/Library/PeilessStartupLib/Hob.c
@@ -21,6 +21,7 @@
 #include <Library/PlatformInitLib.h>
 #include <OvmfPlatforms.h>
 #include <Pi/PrePiHob.h>
+#include <WorkArea.h>
 #include "PeilessStartupInternal.h"
 
 /**
@@ -74,10 +75,13 @@ ConstructFwHobList (
   )
 {
   EFI_PEI_HOB_POINTERS  Hob;
+  EFI_PHYSICAL_ADDRESS  PhysicalStart;
   EFI_PHYSICAL_ADDRESS  PhysicalEnd;
   UINT64                ResourceLength;
   EFI_PHYSICAL_ADDRESS  LowMemoryStart;
   UINT64                LowMemoryLength;
+  UINT64                MaxAcceptedMemoryAddress;
+  TDX_WORK_AREA         *WorkArea;
 
   ASSERT (VmmHobList != NULL);
 
@@ -86,14 +90,31 @@ ConstructFwHobList (
   LowMemoryLength = 0;
   LowMemoryStart  = 0;
 
+  WorkArea = (TDX_WORK_AREA *)FixedPcdGet32 (PcdOvmfWorkAreaBase);
+  ASSERT (WorkArea != NULL);
+  ASSERT (WorkArea->Header.GuestType == CcGuestTypeIntelTdx);
+  MaxAcceptedMemoryAddress = WorkArea->SecTdxWorkArea.MaxAcceptedMemoryAddress;
+  if (MaxAcceptedMemoryAddress == 0) {
+    MaxAcceptedMemoryAddress = MAX_UINT64;
+  }
+
   //
   // Parse the HOB list until end of list or matching type is found.
   //
   while (!END_OF_HOB_LIST (Hob)) {
     if (Hob.Header->HobType == EFI_HOB_TYPE_RESOURCE_DESCRIPTOR) {
-      if (Hob.ResourceDescriptor->ResourceType == EFI_RESOURCE_MEMORY_UNACCEPTED) {
+      if ((Hob.ResourceDescriptor->ResourceType == EFI_RESOURCE_MEMORY_UNACCEPTED) && (Hob.ResourceDescriptor->PhysicalStart < MaxAcceptedMemoryAddress)) {
         PhysicalEnd    = Hob.ResourceDescriptor->PhysicalStart + Hob.ResourceDescriptor->ResourceLength;
         ResourceLength = Hob.ResourceDescriptor->ResourceLength;
+        PhysicalStart  = Hob.ResourceDescriptor->PhysicalStart;
+
+        if ((PhysicalEnd >= MaxAcceptedMemoryAddress) && (PhysicalStart < MaxAcceptedMemoryAddress)) {
+          //
+          // This memory region is split into 2 parts. The left part is accepted.
+          //
+          PhysicalEnd    = MaxAcceptedMemoryAddress;
+          ResourceLength = PhysicalEnd - PhysicalStart;
+        }
 
         if (PhysicalEnd <= BASE_4GB) {
           if (ResourceLength > LowMemoryLength) {
diff --git a/OvmfPkg/Library/PeilessStartupLib/PeilessStartupLib.inf b/OvmfPkg/Library/PeilessStartupLib/PeilessStartupLib.inf
index c5d291f02bcd..2ca49324d8f9 100644
--- a/OvmfPkg/Library/PeilessStartupLib/PeilessStartupLib.inf
+++ b/OvmfPkg/Library/PeilessStartupLib/PeilessStartupLib.inf
@@ -88,3 +88,4 @@
   gEfiMdeModulePkgTokenSpaceGuid.PcdNullPointerDetectionPropertyMask    ## CONSUMES
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvBase
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvSize
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfWorkAreaBase
-- 
2.29.2.windows.2



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